#include <unistd.h>
#include <stdlib.h>
#include "myerr.h"
#define BUFFSIZE 4096

int main(void)
{
	int n;
	char buf[BUFFSIZE];

	while((n = read(STDIN_FILENO, buf, BUFFSIZE)) > 0)
		if (write(STDOUT_FILENO, buf, n) != n)
			err_sys("write error");

	if(n < 0)
		err_sys("read error");
	exit(0);
}